Si、Cu、Mg元素对ZL101合金电导率和力学性能的影响  

Effects of Si, Cu and Mg Addition on Electrical Conductivity and Mechanical Properties of Cast Aluminum Alloys

作　　者：史霞[1] 姚三九[1] 白霄[1] 李思瑞[1] 

机构地区：[1]武汉理工大学材料科学与工程学院

出　　处：《特种铸造及有色合金》2010年第12期1162-1165,共4页Special Casting & Nonferrous Alloys

摘　　要：采用正交试验方法研究了合金元素Si、Cu、Mg加入量对铸造铝合金电导率与力学性能的影响。结果表明,Si改善合金抗拉强度,但Si作为半导体,严重地减少铝基体的有效导电截面,故而降低合金导电性;Cu和Mg明显提高合金的强度,但其固溶在铝基体中,使得基体晶格畸变增加,电子波的散射几率增加,因而降低合金导电性。经T6处理后,合金的电导率和力学性能得到进一步改善提高。Effects of different Si, Cu and Mg additions on electrical conductivity and mechanical properties of cast aluminum alloy were investigated by orthogonal testing. The results reveal that Si can improve tensile strength of the aluminum alloy, however, it can also deteriorate the electrical conductivity as a result of severely reducing effective conductive cross-section as a semi-conductor. Cu and Mg can increase the tensile strength of the alloy while they decrease electrical conductivity as a result of Cu and Mg solving in the aluminum matrix resulting in the increase of matrix lattice distortion and scattering rate of electron wave. Electrical conductivity and mechanical properties of the T6 treated alloy are further improved, which is attributed to the homogeneous precipitation of Mg2Si, Al2Cu, CuMgAl2(S) and Q/W (AlxSi4Mg5Cu4) and the weakness of Si dissevering the matrix.

关 键 词：铸造铝合金 合金元素 电导率 力学性能 

分 类 号：TG113[金属学及工艺—物理冶金]